Piston-ring.



HARRY HARKINS, F SEATTLE, WASHINGTON;

PISTON-RING,

noifssoneo.

Specification of Letters Patent.

Patente May 1 1, 1909.

Application filed June 5, 1908. SerieLNo.-36,830.

To on whom it may concern:-

Be it known that I, l'lAI-li l-Y HARKINs, a citizen of the UnitedStates, residing at Seettle, in .the county of King and State of Weshinon, have invented certain new and useful mprovements in Piston-Rings, of

' which the following is a specification. This invention relates to{fistons end,.

while it may advantageously, 3

e employed in a number of useful services, is Pilltl(511- lerl' valuablein engines operating under a big pressure of steam. v

As is-understood by those familiar with the subject, great difficulty isattendant upon the practice hitherto in use of employing springmetel orspring pressed rings in istons to pack the letter, from the foot t atsuch rings-cannot be made toybesr, through- I out their-circumferences,uniformly against I the cylinder bore, and consequently weer away-thesurface of the latter unevenly, or out of true from which a leakage ofsteam ensuestogether with a direct loss of power auxiliary,- or coking,rings against the cyldue to an increasing amount of friction.

Various devices have been em loyed in endeavors to overcome the troub esabove elluded to, notabl by utilizing the ressure of the power me ium toexpensive y, press inder; and w il'e such expedients may serve 'to makee-practicelly non-leekeble ticking between the piston and cylinder, enfor an unlimited time, it does so by aggravating the aforesaid othertroubles.

It is the objiect of this invention to obviate the above eluded to andother imperfec tions common to engine-pistons without otherwiseimpairing the eflioiency thereof. To this end the invention consists inthe fiovel construction, ode tetion and comhi nation of devices, as wibe described here inefter and more particularly pointedoutin the epended claims.

In t i6 accompanying drawings, Figure l is s side elevation, pertlyinsection, of en engine-piston embodying my invention; Fig. 2 is itperspective view. of the arts shown in Fig. 1- in a. separatedcondition; and Fig. 3 is e fragmentary soctionel view of, n modifiedform of the invention. 1

The reference numeral Sdesiginetes e pis- I ton-hesd provided withpcriYheral marginal flanges 6 and 7 so as to Allen s, cirmnnl'erentielgroove 8 therebctween. For the purposes of this invention the flange Tis detselh ubie end corresponds to the following-ring respectively d spin Planes perpendicu ler tothe piston axis. Provided for this groove ise piston-ring 9 having a centrally disposed web 10 and two laterallyprojecting flanges 11 of an extreme width sueh as' to extend fronuthepiston flengesfi to 7. Seated within each of the angles formed by theweb 10 with the respective flanges 11 are pecking-1'ings 13 which areformed tooccupythe s aces between the ring-web and the etonenges. Thepacking rings are arranged to make locked engegementiwith the ring 10,and accordingly the opposite sides of the web are undercut is at 10 toaccommodate pro'ecting portions 13" of the respective pec 'ng rings,This construction may he attained by forming the web of a,suhstsritielly i shepe, usin Figs/1' end-2, or with c doye-teilconfiguration, as represented in Fig. 3, with the pecking-fin scorrespondinglyformed to make inter ttingconnections between the rings10 end 13.

In carr in out'my invention, the ring 10 is desirsh y 0 iron andcast toa size slightly greater in length and dimneterthen thee-on respondingres ee'tive dimensions of the piston groove an the bore of the cylinder,and is then turned down to the length of the 'groove and slotted, as at14, to remove suiiioient metal therefrom to allow the ends thus providedbeing drawn toward each other for its erting the requisite elasticity tothe ring an be oi'eslightly less diameter then'the cyl inder bore. y

The rings 13 mey be made of any suitable material and ere likewise Castto reeter'dimensions than the spaces which t ey are to occupy and arethen machined to size and sldtied he at '15, to allow oitheirbeingenteredinti; the cylinder bore and to inteiiit with the ring web It). Aswing or springs; may he interposed between t 1e rin 9 and the bottom ofthe groove 8, ordepen once may be had upon the elasticity of the ring tomaintain the rin s13in operative contact withthe cyhnderlmre. v

The edventeges of this invention reside rincip'elly in the distributionof the outward oroe upon] the packing rings necessary to.

cause the same to properly hen-r against the interior of a. cylinder,end which is spoons plished loy locking the piston rings with the gseer-see controlling ring, both as to airy radial contracting orexpanding movements, while permitting unobstructed corresponding move-'ments with respect to the piston head.

Having described my inventlon, What I claim as new and desire to secureby Letters glatent is- -1., The combination with a piston-headprovidedwith a peripheral groove, a resilient 10 l. v pymg the entire widththereof, and said ring,

,- means comprising packing rings for lock- .7 substantially as liescribe Elston ring seated in said groove and occuing said. rin inposition and restraining the same from fressmg against the bore of acontaining cylinder; substantially as described. 2. The combination witha piston-head provided with a peripheral groove having the opposin facesof its flanges respectively arranged in lanes perpendicular to the axisof the head, of a resilient piston ring positioned in sei groove, andpacking rings ex tending around the piston and protruding into recessesin the iston ring wherein the d in operative position,

letter is reliably he 3 The combination or a piston-head 1Jlovided witha peripheral groove; a' resilient piston ring having a web which issubstantieily T-shopc in cross section, and a packing ring for each ofthe cavities formed by the adjacent flanges of the piston head and therecesses of the piston-ring web, substantially as and for the purposesdescribed.

4. The combination with a piston-head having a peripheral grooveintermediate two marginal flanges whose inner i'nces'arc perpendicularto the axis of the head, of a resilient piston ring of a width to iitbetween said -flanges, said ring being provided with a web having arecessed face, and a packing ring having op )osite laces arranged tocorrespond respective y with said recessed face of the packing ring andthe perpendicuhr face of the opposing of said flanges.

Signed this 22nd of May 1908, in the presence of two witnesses.

HARP?! HAHKINS. 1n the presence oi- I'IORACE BARNES. A. B. SMITH.

ill)

